Efficacy of trans-cinnamaldehyde against Psoroptes cuniculi in vitro
2012
Shen, Fengge | Xing, Mingxun | Liu, Lihui | Tang, Xudong | Wang, Wei | Wang, Xiaohong | Wu, Xiuping | Wang, Xuelin | Wang, Xinrui | Wang, Guangming | Zhang, Junhui | Li, Lei | Zhang, Jiyu | Yu, Lu
The acaricidal activity of trans-cinnamaldehyde was evaluated in vitro on Psoroptes cuniculi. In this study, different concentrations of trans-cinnamaldehyde were tested, and the observed mites mortality was compared with that observed in untreated and treated (Acacerulen R®) controls. The morphological changes in P. cuniculi treated with trans-cinnamaldehyde were examined with light microscopy. By the analysis of variance one-way test, up to 8 μg/ml of trans-cinnamaldehyde gave highly significant (P < 0.01) percentages of mite mortality compared with the untreated controls, but only up to 256 μg/ml, it showed the same efficacy of Acacerulen R®. At the same time, a bioassay was conducted by exposing mites to varying doses of trans-cinnamaldehyde in vitro cultures. The resulting data were analyzed by using a time–dose–mortality modeling technique, yielding the parameters for time and dose effects of P. cuniculi. The β value was 2.01, indicating that trans-cinnamaldehyde had a good activity to kill P. cuniculi adults. Based on the time–dose–mortality relationships fitted and the virulence indices estimated, trans-cinnamaldehyde is a promising microbial agent for mites control.
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